# File lib/vlad/perforce.rb, line 18
  def export(revision_or_source, destination)
    if revision_or_source =~ /^(\d+|head)$/i then
      "(cd #{destination} && #{p4_cmd} sync ...#{rev_no(revision_or_source)})"
    else
      "cp -r #{revision_or_source} #{destination}"
    end
  end